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Technical Discussions
Bruce Owen
Bruce Owen
03:08 May-25-2002
Resdidual magnetism in pipes

Is there an accepted reference Standard for the maximum permissible residual magnetism existing at the ends of gas pipes, or similar, prior to welding, which will not effect the welding procedure, eg arc deflection, blowout.

Replies will be appreciated
Bruce Owen


 
 Reply 
 
David Hermanutz
Consultant,
Hbndt.com, China, Joined Jul 2012, 85

David Hermanutz

Consultant,
Hbndt.com,
China,
Joined Jul 2012
85
04:14 May-25-2002
Re: Resdidual magnetism in pipes
: Is there an accepted reference Standard for the maximum permissible residual magnetism existing at the ends of gas pipes, or similar, prior to welding, which will not effect the welding procedure, eg arc deflection, blowout.
.
: Replies will be appreciated
: Bruce Owen
.

Hi Bruce,

While I was working in Canada Nova Pipelines had an excellant procedure developed which had max. allowable and methods to remove the magnetism using cable wraps etc.

This came in to play quite often as the right of way we were constructing along ran North South with the added benefit of a power transmission line along to the left.

I would suggest you contact someone from the visual department of Canspec testing ( www.canspec.com ) or RTD www.rtdqualty.com, they may be able to pull out the details or put you onto someone who can.

I cannot recall seeing residual magnetism specified in the canadian or american pipeline standards, most often it was an in-house procedure.

Best Regards,

David Hermanutz

Panametrics Melbourne
Mobile: 0411879064
Fax 61-3-9562-8755


www.panametrics.com
www.everestvit.com
www.rohmann.de




 
 Reply 
 
MOHAMMED SHAHREYAR
MOHAMMED SHAHREYAR
08:06 Dec-20-2018
Re: Resdidual magnetism in pipes
In Reply to Bruce Owen at 03:08 May-25-2002 (Opening).

Yes, API-5L, 46 edition, ANNEX E, clause E.7.6 is directly concerned with this. It states that 4 readings shall be taken on the circumference of the pipe 90 degrees apart. The average of four resdings shall be less than or equal to 30 gauss, and no individual reading shall exceed 35 gauss.

 
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